
<div id="xxx" class="fluent-nav-menu" style="width: 100%;" role="menu" aria-expanded="" b-dpnvrc1pyz="" blazor:elementreference="xxx">
  <div aria-label="Navigation menu" aria-expanded="true" role="menuitem" class="fluent-nav-item" tabindex="0" blazor:onclick="1" blazor:onkeydown="2" b-dpnvrc1pyz="">
    <div class="positioning-region" b-dpnvrc1pyz="">
      <div class="content-region" b-dpnvrc1pyz="">
        <div>custom expander</div>
      </div>
    </div>
  </div>
</div>